Hot melt drill with high performance coating

Abstract

The utility model relates to a hot-melt drill with a high-performance coating, which comprises a hot-melt drill base material and the high-performance coating coated on the outer wall of a drill bit of the hot-melt drill base material, and the high-performance coating is a nano composite multilayer coating and sequentially comprises a base coat, a transition layer, a multilayer composite functional layer and an outer layer from inside to outside. According to the hot melting drill with the high-performance coating, the nano-composite multi-layer coating is additionally arranged on the surface of an original hot melting drill bit, the abrasion resistance, the high-temperature hardness and the high-temperature oxidation resistance of the drill bit can be remarkably improved, about 200 holes can be machined, the quality of the machined holes is high, chipless connection is achieved, and the service life is prolonged by about three times.

Description

Technical Field

[0001] The utility model relates to the technical field of coating processing, and particularly relates to a hot melt drill with a high-performance coating. Background Technique

[0002] The hot melt drilling process is a chip-free processing technology for machining holes and bushings on metal sheets or pipes at one time, completely replacing the process of welding (riveting) nuts on thin-walled workpieces. The hot melt drill is made of wear-resistant and high-temperature-resistant cemented carbide material.

[0003] When the tool contacts the workpiece, a high rotational speed (1000 - 3500) and an appropriate axial thrust (feed force) cause intense friction between the drill bit and the metal, instantly reaching a temperature of 650 - 750 °C. The metal in the area near the drill bit quickly softens. Continuing to apply axial pressure, a boss and a bushing about 3 times the thickness of the original sheet are quickly extruded on the upper and lower surfaces of the workpiece. The whole process only takes 2 - 6 seconds. For the processing of surfaces that require smooth connections or chamfered holes, a flat drill bit can be used to cut off the boss formed on the workpiece surface. The bushing can be used as a bearing support, a bifurcated throat weld joint, etc., and can also be tapped for threaded connections. The thread is formed by rolling, and the processed thread can withstand higher tensile force and torque. The chip-free drilling process is suitable for processing common steel, stainless steel, aluminum, copper, and other various ductile workpiece materials, and can also process electroplated workpieces. It can be used on a manual bench drill or a CNC machine tool, with a required power of 1.5 - 3.5 kW and a spindle speed of 1000 - 3500 r / min. According to the different diameters of the holes to be processed, workpiece materials, and thicknesses, the selected cutting parameters are also different. Advantages: High efficiency, economy, material saving, and the processed workpieces are relatively beautiful. However, the disadvantage is that the uncoated one can only process dozens of holes before significant wear occurs, resulting in a high cost. Content of the Utility Model

[0004] In view of the above problems, the utility model proposes a hot melt drill with a high-performance coating that can greatly improve the service life of the hot melt drill.

[0005] The utility model is realized through the following technical solutions:

[0006] A hot melt drill with a high-performance coating includes a hot melt drill substrate and a high-performance coating coated on the outer wall of the drill bit of the hot melt drill substrate. The high-performance coating is a nano-composite multi-layer coating, which sequentially includes a primer layer, an intermediate layer, a multi-layer composite functional layer, and an outer layer from the inside to the outside.

[0007] In a preferred embodiment of the utility model, the hot melt drill substrate is made of cemented carbide material.

[0008] Preferably, the thickness of the nano-composite multi-layer coating is 3 - 5 μm.

[0009] Among them, the nano-composite multi-layer coating is coated on the outer wall of the drill bit of the hot melt drill substrate by PVD arc ion plating.

[0010] Among them, the underlayer is a Cr-CrN underlayer.

[0011] Among them, the transition layer is an AlCrSiN transition layer.

[0012] Among them, the multi-layer composite functional layer is an AlCrSiN / AlCrSiXN composite functional layer, including a first multi-layer composite functional layer and a second multi-layer composite functional layer. The thickness ratio of the first multi-layer composite functional layer is 1:1 - 1:2.5, the number of layers of the first multi-layer composite functional layer is 3 - 6 layers, the thickness ratio of the second multi-layer composite functional layer is 1:2.5 - 1:3.5, and the number of layers of the second multi-layer composite functional layer is 5 - 10 layers.

[0013] Among them, the outer layer is an AlCrSiXN layer.

[0014] Among them, X in the AlCrSiXN layer refers to one of the elements such as W, V, Cu, Ta, etc.

[0015] Among them, the nano-composite multi-layer coating is coated on the outer wall of the drill bit of the hot melt drill substrate by PVD arc ion plating.

[0016] Among them, the post-treatment of the hot melt drill coating is polishing post-treatment, and the post-treatment is in the form of jet polishing.

[0017] The beneficial effects of the present utility model are as follows: The hot melt drill with a high-performance coating can significantly improve the wear resistance, high-temperature hardness and high-temperature oxidation resistance of the drill bit by adding a nano-composite multi-layer coating on the surface of the original hot melt drill bit. It can process about 200 holes, and the quality of the processed holes is high, achieving chip-free connection, and the service life is increased by about 3 times. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the hot melt drill with a high-performance coating of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the nano-composite multi-layer coating of the present utility model;

[0020] Figure 3 is a schematic structural diagram of the production target of the nano-composite multi-layer coating of the present utility model. DETAILED DESCRIPTION OF THE INVENTION

[0021] The following elaborates on the preferred embodiments of the present utility model in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0022] As Figure 1 shown, a hot melt drill with a high-performance coating includes a hot melt drill substrate 1 and a high-performance coating 2 coated on the outer wall of the drill bit of the hot melt drill substrate 1. The high-performance coating 2 is a nano-composite multi-layer coating. Among them, the hot melt drill substrate 1 is made of cemented carbide material, specifically, the cemented carbide material is W1 (WC / Co 12% Ultrafine), ultra-fine powder. The thickness of the nano-composite multi-layer coating is 3-5 μm, the hardness is greater than HV3500, and it is produced by PVD arc ion plating process. After coating, it undergoes jet polishing post-treatment.

[0023] Specifically, as shown in Figure 2 , the nano-composite multi-layer coating sequentially includes an underlayer 3, an intermediate layer 4, a first multi-layer composite functional layer 5, a second multi-layer composite functional layer 6, and an outer layer 7 from the inside to the outside. Among them, the underlayer 3 is a Cr-CrN underlayer, the intermediate layer 4 is an AlCrSiN intermediate layer, and both the first multi-layer composite functional layer 5 and the second multi-layer composite functional layer 6 are AlCrSiN / AlCrSiXN composite functional layers. The thickness ratio of the first multi-layer composite functional layer 5 is 1:1 - 1:2.5, and the number of layers of the first multi-layer composite functional layer 5 is 3 - 6 layers. The thickness ratio of the second multi-layer composite functional layer 6 is 1:2.5 - 1:3.5, and the number of layers of the second multi-layer composite functional layer 6 is 5 - 10 layers. The outer layer 7 is an AlCrSiXN layer, where X is an element such as W, V, Cu, Ta, etc.

[0024] This nano-composite multi-layer coating is produced using 4 rectangular targets. As shown in Figure 3 , among them, both A and C are Cr targets, B is an AlCrSi target, and D is an AlCrSiX target, or A is a Cr target, C is an AlCrSiX target, and B and D are AlCrSi targets.

[0025] By adding a nano-composite multi-layer coating on the surface of the original hot melt drill bit, this hot melt drill with a high-performance coating can significantly improve the wear resistance, high-temperature hardness, and high-temperature oxidation resistance of the drill bit. It can process about 200 holes, and the quality of the processed holes is high, achieving chip-free connection, and the service life is increased by about 3 times.

[0026] Finally, it should be noted that the above embodiments are only specific implementation manners of the present utility model, used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any technician familiar with the technical field of the present utility model can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A hot melt drill with a high-performance coating, comprising a hot melt drill substrate and a high-performance coating applied to the outer wall of the drill bit of the hot melt drill substrate, characterized in that: The high-performance coating is a nano-composite multi-layer coating, which sequentially includes a primer layer, a transition layer, a multi-layer composite functional layer and an outer layer from the inside to the outside; The primer layer is a Cr-CrN primer layer; The transition layer is an AlCrSiN transition layer; The multi-layer composite functional layer is an AlCrSiN / AlCrSiXN composite functional layer, including a first multi-layer composite functional layer and a second multi-layer composite functional layer. The thickness ratio of the first multi-layer composite functional layer is 1:1 - 1:2.5, and the number of layers of the first multi-layer composite functional layer is 3 - 6. The thickness ratio of the second multi-layer composite functional layer is 1:2.5 - 1:3.5, and the number of layers of the second multi-layer composite functional layer is 5 - 10; The outer layer is an AlCrSiXN layer; In the AlCrSiXN layer, X refers to one of W, V, Cu, and Ta.

2. The hot melt drill with a high-performance coating according to claim 1, wherein: The hot melt drill substrate is made of cemented carbide material.

3. The hot melt drill with a high-performance coating according to claim 1, characterized in that: The thickness of the nano-composite multi-layer coating is 3 - 5 μm.

4. The hot melt drill with a high-performance coating according to claim 1, characterized in that: The nano-composite multi-layer coating is coated on the outer wall of the drill bit of the hot melt drill substrate by PVD arc ion plating.

5. The hot melt drill with a high-performance coating according to claim 1, characterized in that: The post-treatment of the hot melt drill coating is polishing post-treatment, and the post-treatment is in the form of jet polishing.

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